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Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper

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On 10/21/15 9:49 PM, Wangnan (F) wrote:
> After applying this patch I'm unable to use perf passing perf_event
> again like this:

please do not top post and trim your replies.

>   # perf record -a -e evt=cycles -e
> ./test_config_map.c/maps.pmu_map.event=evt/ --exclude-perf ls
>
> With -v it output:
>
> ...
> adding perf_bpf_probe:func_write
> adding perf_bpf_probe:func_write to 0x367d6a0
> add bpf event perf_bpf_probe:func_write_return and attach bpf program 6
> adding perf_bpf_probe:func_write_return
> adding perf_bpf_probe:func_write_return to 0x3a7fc40
> mmap size 528384B
> ERROR: failed to insert value to pmu_map[0]
> ERROR: Apply config to BPF failed: Invalid option for map, add -v to see
> detail
> Opening /sys/kernel/debug/tracing//kprobe_events write=
> ...
>
> Looks like perf sets attr.inherit for cycles? I'll look into this problem.

yes. that's perf default.
How did it even work before?!
I was testing with your samples/bpf/tracex6 that sets inherit to zero.

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[PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper Alexei Starovoitov <ast@plumgrid.com> - 2015-10-22 01:00 +0200
  Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper "Wangnan (F)" <wangnan0@huawei.com> - 2015-10-22 07:00 +0200
    Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper Alexei Starovoitov <ast@plumgrid.com> - 2015-10-22 07:10 +0200
      Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper "Wangnan (F)" <wangnan0@huawei.com> - 2015-10-22 07:40 +0200
  Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper "Wangnan (F)" <wangnan0@huawei.com> - 2015-10-22 07:40 +0200
    Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper Alexei Starovoitov <ast@plumgrid.com> - 2015-10-22 08:30 +0200
      Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper "Wangnan (F)" <wangnan0@huawei.com> - 2015-10-22 09:50 +0200
        Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper Alexei Starovoitov <ast@plumgrid.com> - 2015-10-22 18:00 +0200
  Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper "Wangnan (F)" <wangnan0@huawei.com> - 2015-10-22 14:40 +0200
    Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper Peter Zijlstra <peterz@infradead.org> - 2015-10-22 14:50 +0200
  Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper Peter Zijlstra <peterz@infradead.org> - 2015-10-22 16:00 +0200
    Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper Alexei Starovoitov <ast@plumgrid.com> - 2015-10-22 18:00 +0200

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